JP3279028B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art As shown in FIG.
The fixed scroll 101 having spiral blades and the orbiting scroll 102 are engaged with each other in a state of being shifted by 180 degrees from each other, thereby forming a plurality of radially symmetric left and right compression working areas. Is swirled, so that the refrigerant gas taken in at the outer peripheral portion in the radial direction of the swirl vane is moved in the working space 103.
, And is discharged from the discharge port 104 provided near the center of the fixed scroll 101.

[0003] In a scroll compressor based on such a principle, the ratio (compression ratio) between the suction start pressure and the compression end pressure is uniquely determined by the scroll shape, regardless of the pressure conditions during operation. You. For this reason, a symmetrical compression work space 103 compressed to near the center portion
However, the pressure in the working space may be lower than the discharge pressure at the moment of communication with the discharge port 104. At that time, there is a problem that the fluid flows backward from the discharge space into the working space which is communicated with the work space through the discharge port 104, causing a pressure loss or an energy loss and further increasing the fluctuation of the discharge pressure. In addition, when the compressor is stopped, high-pressure gas flows from the discharge port 104, causing the orbiting scroll 102 to reverse.

In order to solve the above-mentioned problem, a check valve 105 is provided at the discharge port of the fixed scroll 101 as disclosed in Japanese Patent Application Laid-Open No. 55-351151.
There is a means of providing. FIG. 6 shows a sectional view of an example of this means.

[0005]

However, in the above-described conventional check valve 105, one end of the check valve 105 is fixed to the fixed scroll 101, and the discharge port 10 is provided near the tip of the other end.
4 was to open and close. Therefore, the check valve 10
5 is opened and closed with the discharge of the compressed fluid, and a loud impact noise is generated at the moment when the valve is closed, thus impairing the advantage of the quietness inherent in the scroll compressor. Further, there has been a problem that the check valve 105 increases the discharge resistance against the discharge gas and causes a reduction in efficiency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a high-efficiency scroll compressor which reduces an impact sound generated when a check valve is closed.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a compression mechanism having a fixed scroll having a spiral blade and a plurality of compression working spaces formed by meshing with the fixed scroll. A scroll compressor having a compression mechanism composed of a orbiting scroll having swirled vanes and a rotation restricting component for restricting rotation of the orbiting scroll and performing orbiting motion, wherein one end in the longitudinal direction is fixed to the fixed scroll. A check valve made of a fixed elastic body is attached at the end opposite to the fixed end to the width in the longitudinal direction.
The check scroll has a wide spoon shape, and the discharge port provided near the center of the fixed scroll is disposed near the center in the longitudinal direction of the check valve .

Further, a surface portion of the check valve located at the discharge port has a shape capable of covering the area of the discharge port, and a width in a longitudinal direction is smaller than the discharge port diameter.

Further, the end face opposite to the fixed end is formed wider than the width in the longitudinal direction.

Furthermore, a counterbore is provided in the discharge port, and the discharge passage is enlarged stepwise.

[0011]

According to the present invention, the check valve is arranged so that the discharge port is located near the center in the longitudinal direction of the check valve. Therefore, during operation, the check valve is fixed near the discharge port. The valve opens in a shape that maximizes the separation distance from the scroll, and the separation distance at the end opposite to the fixed end of the check valve is reduced. The excitation force for collision with the fixed scroll in the above is suppressed, and the generated impact noise is reduced.

Also, the surface of the check valve located at the discharge port has a shape capable of covering the area of the discharge port, and the width in the longitudinal direction is smaller than the diameter of the discharge port. And the discharge resistance is reduced, thereby improving the efficiency.

Further, at the end face of the check valve opposite to the fixed end to which a relatively large impact force is applied, the strength can be improved by making the shape wider than the longitudinal width, so that reliability is secured. You.

Further, a counterbore is provided at the discharge port provided on the fixed scroll to increase the passage volume, thereby reducing the passage resistance to the discharge gas and improving the efficiency.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll compressor according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention, FIG. 2 is a sectional view of a check valve device, and FIG. 3 is a sectional view of a check valve. Show.

In FIG. 1, the compression mechanism is composed of a fixed scroll 2 having spiral blades, an orbiting scroll 3 and a rotation restricting member 4 of the orbiting scroll. The fixed scroll 2 is fixed to the closed casing 1 together with a bearing member 5. ing. The orbiting scroll 3 is a shaft 7 on which an electric motor 6 is disposed.
Is swiveled. The shaft 7 is rotatably supported at both ends by a main bearing 8 and a sub bearing 9 disposed on the bearing member 5.

By orbiting the orbiting scroll 3 with respect to the fixed scroll 2, the refrigerant gas taken in at the outer peripheral portion 15 in the spiral blade radial direction is continuously compressed in the working space 10, and the center of the fixed scroll 2 is moved. It is discharged from the discharge port 11 arranged near the section.

When the compression end pressure is higher than the pressure in the discharge space 12, the check valve 13 opens to the discharge space 12 side, and the discharge port 11 communicates with the discharge space 12, so that the compressed fluid is discharged. Is done. If the pressure in the compression work space 10 at the moment of communication is lower than the pressure in the discharge space 12, the check valve 13
Is not yet opened, and the orbiting scroll 3 is further turned to compress the refrigerant gas, and the check valve 13 is opened only when the pressure in the compression working space 10 becomes higher than the pressure in the discharge space 12. The refrigerant gas discharged into the discharge space 12 is discharged from the discharge pipe 16 through the space in the shell.

On the other hand, when the operation is stopped, the check valve 13 is closed by the high-pressure refrigerant gas in the discharge space 12, the inflow of the high-pressure refrigerant gas into the working space 10 is prevented, and the reverse rotation of the orbiting scroll 3 is avoided. . Further, a valve retainer 14 for regulating the opening height of the check valve 13 is provided to protect the check valve in the event of abnormal pressure rise due to liquid compression or the like, and to prevent plastic deformation and fatigue failure of the check valve.

As shown in FIG. 2, the check valve 13 is arranged such that the discharge port 11 is located near the center of the check valve 13 in the longitudinal direction. During operation, the check valve 13 opens in a shape such that the distance between the check valve 13 and the fixed scroll 2 is maximized near the discharge port 11, and the check valve 13 has an end opposite to the fixed end of the check valve 13. Is reduced, the collision excitation force on the scroll 2 at the tip of the check valve 13 when the check valve 13 is closed is suppressed, and the generated impact noise is reduced.

As shown in FIG. 3, the surface portion 13a located at the discharge port 11 of the check valve 13 has a shape capable of covering the area of the discharge port 11, and the longitudinal width 13b is smaller than the discharge port diameter. Thus, the spring constant of the check valve 13 which is an elastic pair is reduced, and the discharge resistance is reduced, so that the efficiency can be improved.

Further, the strength of the end face portion 13c opposite to the fixed end of the check valve 13 to which a relatively large impact force is applied can be improved by making the shape wider than the width 13b in the longitudinal direction. Secured.

FIG. 4 is a sectional view of a discharge port provided in a fixed scroll according to a second embodiment of the present invention. By providing a counterbore 17 in the discharge port 11 and increasing the passage volume, the passage resistance to the discharge gas is reduced, and the efficiency can be improved.

The counterbore shape is not limited to this embodiment, as long as the passage area can be enlarged.

[0026]

As apparent from the above description, the present invention provides a compression mechanism including a fixed scroll having a spiral blade,
The orbiting scroll has a spiral blade arranged so as to form a plurality of compression working spaces in mesh with the fixed scroll, and a rotation restricting component for restricting the rotation of the orbiting scroll and performing a orbiting motion. In a scroll compressor having a compression mechanism, a check valve formed of an elastic body having one end in a longitudinal direction fixed to the fixed scroll is provided with a discharge port provided near a central portion of the fixed scroll near a central portion in the longitudinal direction. Arranged so that the surface portion of the check valve located at the discharge port has a shape capable of covering the area of the discharge port, the width in the longitudinal direction is smaller than the diameter of the discharge port, and the opposite side from the fixed end. By making the end face shape wider than the width in the longitudinal direction, noise reduction and efficiency and reliability can be improved.

Further, by providing a counterbore in the discharge port provided in the fixed scroll and gradually expanding the discharge passage, the efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the check valve device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a check valve according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a discharge port provided on a fixed scroll according to a second embodiment of the present invention.

FIG. 5 is a compression principle diagram of a scroll compressor.

FIG. 6 is a cross-sectional view of a check valve device in a conventional example.

[Explanation of symbols]

 Reference Signs List 2 fixed scroll 3 orbiting scroll 4 rotation restricting component 10 compression working space 11 discharge port 13 check valve 13a surface portion located at discharge port of check valve 13b width of check valve in longitudinal direction 13c what is fixed end of check valve Opposite end 17 Counterbore

──────────────────────────────────────────────────続 き Continued on the front page (72) Shozo Hase, 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Taisei Kobayakawa 1006 Kadoma, Kadoma, Kadoma, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Takashi Morimoto 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Sano 1006, Ojidoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) JP-A-5-133352 (JP, A) JP-A-3-130589 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (3)

(57) [Claims] The orbiting scroll includes a fixed scroll having a swirling blade, a orbiting scroll having a swirling blade arranged so as to form a plurality of compression working spaces by meshing with the fixed scroll, and a rotation of the orbiting scroll. In a scroll compressor having a compression mechanism constituted by a rotation constraining component for performing a constrained orbiting motion, a check valve made of an elastic body having one end in a longitudinal direction fixed to the fixed scroll is opposed to a fixed end. The side end is the width in the longitudinal direction.
A scroll compressor having a wider spoon shape and a discharge port provided near a central portion of the fixed scroll disposed near a central portion in a longitudinal direction of the check valve . Wherein the surface portion located in the discharge port of the check valve with a shape capable of covering the discharge port, the check valve, opposite the fixed end
2. The scroll compressor according to claim 1, wherein the width in the longitudinal direction excluding the side end is smaller than the discharge port diameter. 3. The scroll compressor according to claim 1, wherein a counterbore is provided in a discharge port provided near a center portion of the fixed scroll, and a discharge passage is enlarged stepwise.